In the process of urine formation, the step that involves selective reabsorption of glucose, amino acids, and water from the filtrate back into the blood is: MCQ with Answer and Explanation
In the process of urine formation, the step that involves selective reabsorption of glucose, amino acids, and water from the filtrate back into the blood is:
A. Ultrafiltration
B. Tubular reabsorption
C. Tubular secretion
D. Glomerular filtration
Answer: Option B
Solution (By JKExamLibrary)
Tubular reabsorption occurs mainly in the proximal convoluted tubule, where essential substances like glucose, amino acids, and most water are reabsorbed into peritubular capillaries via active and passive transport. Glomerular filtration/ultrafiltration is the initial passive filtration of blood. Tubular secretion adds substances like H⁺ and K⁺ to filtrate.
Explanation:
CNS = brain + spinal cord. The peripheral nervous system (PNS) includes cranial and spinal nerves. The autonomic nervous system controls involuntary functions.
Explanation:
Folic acid (vitamin B₉) is reduced to tetrahydrofolate (THF), which carries one-carbon groups in amino acid and nucleotide metabolism. Biotin is for carboxylation, riboflavin for redox, thiamine for decarboxylation.
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